Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f9ca8818e17e89…

MALICIOUS

PDF

64.4 KB Created: 2020-10-27 21:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f93ad97b2822e1b29f5848fe37e6deda SHA-1: 22c1b99c4e46ca0afb1daf14b599029c4a5424ce SHA-256: 77f9ca8818e17e897979eda74b3c45206388093c4d10adf1bf6af78ca6a5df8a
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/pify?keyword=siscon+ani+to+brocon+imouto+ga+shoujiki+ni+nattara In PDF document text
    • https://lebuwaner.weebly.com/uploads/1/3/4/4/134478239/3561813.pdfIn PDF document text
    • https://lifotuvuzaraxur.weebly.com/uploads/1/3/0/7/130775275/6029127.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/makumepaju-kewebovidibapub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_5f9756354a5fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_5f964fcac7f96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_5f8a2294a5b51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380545/normal_5f8f45aba60e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8020/3416/files/49545645133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b12cba7d-cd5a-475e-a6f9-916b21970380/bovagamagijasunuwuwimuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4ea139-db15-4af3-89ba-92c2d3a4cd24/40894223663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/877035c9-e4c4-4758-9426-a3abcecbdf65/historia_de_cronopios_y_famas.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/cadena_de_valor_de_starbucks.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/amazfit_bip_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/67388618329.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/zimafapadebipal.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/case_study_method_in_qualitative_research.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/30576155025.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA11 4768 bytes
SHA-256: cb8f509bd770c237108abf52f5cb10784c91ef1650470df9e6fad0061cd04007
font_01_sfnt_off0000baef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEF 5564 bytes
SHA-256: 5c35ba4a5b3398d9fb6ba672831d7b4c945305556830db84e029715824400720
font_02_sfnt_off0000cda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA2 11268 bytes
SHA-256: 6e32b82b632cf940d3bfc6402aa2599ee1c30c63cbe81c32679ccdc4e315f0b2

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